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Blue-winged Olives
Baetis

Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.

Ephemerella aurivillii Mayfly Nymph Pictures

I have collected this species in Montana but it is very common in Alaska streams.

This mayfly was collected from the Kwethluk River in Alaska on June 19th, 2010 and added to Troutnut.com by Bnewell on June 26th, 2011.

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